Congrats on the OC SBlaster! Please post your voltage settings for 3.6ghz at both 1600mhz and 1800mhz so that we can all compare notes and add to our knowledge pool

Generally speaking, tighter timings are preferable to a faster RAM clock speed on nForce boards. CAS3 at 800mhz is nothing to scoff at. You might also want to try for a T1 command rate at 800mhz. If you can achieve it (and I'd say you have a good shot,) you'll realize a nice performance boost.